ZyXEL Communications P-660R-Tx v2 Series Support Notes page 39

The most often used port numbers are shown in the following table. Please
refer RFC 1700 for further information about port numbers.
Service
FTP
Telnet
SMTP
DNS (Domain Name Server)
www-http (Web)
PPTP (Point-to-Point Tunneling
Protocol)
• Examples
•
Internet Access Only
•
Internet Access with an Internal Server
•
Using Multiple Global IP addresses for clients and servers
•
Support Non NAT Friendly Applications
(1) Internet Access Only
In our Internet Access example, we only need one rule where all our ILAs map
to one IGA assigned by the ISP. You can just use the default SUA NAT, or you
could select Full Feature NAT and select an Address Mapping Set with a
Many-to-One Rule. See the following figure.
(2) Internet Access with an Internal Server
All contents copyright © 2006 ZyXEL Communications Corporation.
P-660R-Tx v2 Series Support Notes
Port Number
21
23
25
53
80
1723
39